Get a list of Observation objects.

### Available end points:

- `/observations/` - Will list all Results in the database
- `/observations.json` - Will return all Results in json format. This can
also be achieved by using the accept header. `application/json`
- `/observations/<object_id>/` - Returns Results object with that id

### Available Methods:

- `GET`
- `HEAD`

### Available filters:

- `title`
- `uuid`
- `keywords`
- `status`
- `result_field`
- `discoveryKeywords`
- `updateFrequency`
- `nonGeographicFlag`
- `publicationState`
- `permissions`

### How to use filters:

These filters can be used like django query filters using __ for related model relationships.

- `/observations/?uuid=d594d53df2612bbd89c2e0e770b5c1a0`
- `/observations/?status=completed`
- `/observations/?results_field__dataPath__startswith=/neodc/esacci`
- `/observations/?discoveryKeywords__name=ESACCI`
- `/observations/?nonGeographicFlag=True`

Filters can be stacked to build an 'AND' relationship. E.g.

- `/observations/?publicationState__in=published,citable&nonGeographicFlag=True`
- `/observations/?publicationState__in=published,citable&discoveryKeyword__name=NDGO0003`

GET /api/v2/observations/26434/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 26434,
    "uuid": "58f00d8814064b79a0c49662ad3af537",
    "title": "ESA Fire Climate Change Initiative (Fire_cci): MODIS Fire_cci Burned Area Pixel product, version 5.1",
    "abstract": "The ESA Fire Disturbance Climate Change Initiative (CCI) project has produced maps of global burned area derived from satellite observations. These MODIS Fire_cci v5.1 pixel products are distributed as 6 continental tiles and are based upon data from the MODIS instrument onboard the TERRA satellite at 250m resolution for the period 2001-2020.  This product supersedes the previously available MODIS v5.0 product. The v5.1 dataset was initially published for 2001-2017, and has later been periodically extended to include 2018 to 2022.\r\n\r\nThe Fire_cci v5.1 Pixel product described here includes maps at 0.00224573-degrees (approx. 250m) resolution. Burned area(BA) information includes 3 individual files, packed in a compressed tar.gz file: date of BA detection (labelled JD), the confidence level (CL, a probability value estimating the confidence that a pixel is actually burned), and the land cover (LC) information as defined in the Land_Cover_cci v2.0.7 product.\r\n\r\nFiles are in GeoTIFF format using a geographic coordinate system based on the World Geodetic System (WGS84) reference ellipsoid and using Plate Carrée projection with geographical coordinates of equal pixel size. For further information on the product and its format see the Fire_cci Product User Guide in the linked documentation.",
    "keywords": "ESA, CCI, Pixel, Burned Area, Fire Disturbance, Climate Change, GCOS",
    "publicationState": "citable",
    "dataPublishedTime": "2018-11-01T13:24:27",
    "doiPublishedTime": "2018-11-01T13:24:27",
    "updateFrequency": "asNeeded",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/26682/?format=api",
        "dataPath": "/neodc/esacci/fire/data/burned_area/MODIS/pixel/v5.1/",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 60713675075,
        "numberOfFiles": 1680,
        "fileFormat": "Data are in GeoTiff format and is composed of 4 files:\r\n...JD.tif: Day of first detection (Julian Day) of the burned area;\r\n...CL.tif: Confidence level of burned area detection;\r\n...LC.tif: Land cover of the pixel detected as burned as defined by the Land Cover CCI v2.0.7 product;\r\n....xml: Metadata of the product.\r\n\r\nThe Coordinate Reference System (CRS) used is a geographic coordinate system (GCS) based on the World Geodetic System 84 (WGS84) reference ellipsoid and using a Plate Carrée projection with geographical coordinates of equal pixel size."
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/9185/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/529/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [],
    "dataLineage": "Data was produced by the ESA Fire CCI team as part of the ESA Climate Change Initiative (CCI) and is being held on the CEDA (Centre for Environmental Data Analysis) archive as part of the ESA CCI Open Data Portal project.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/9777/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/9690/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/13255/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/12683/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/110911/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/110913/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/110914/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/110915/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/110938/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/140425/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/140426/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/110912/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/110916/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/110939/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/112221/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/110929/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/110921/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": "https://api.catalogue.ceda.ac.uk/api/v2/composites/25857/?format=api",
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2539/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "https://artefacts.ceda.ac.uk/licences/specific_licences/esacci_fire_terms_and_conditions.pdf",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        },
        {
            "ob_id": 1140,
            "name": "ESACCI"
        }
    ]
}